Libertarianism seems to be arguing, however, that (a) is the correct and proper action.

You don't seem like someone well-acquainted with the relevant literature. If a policy seems obviously correct, and doesn't involve coercing someone else into doing things against their will, then Libertarianism (at least, read as roughly equivalent to Lockean classical liberalism) won't tell you not to do it.

A lot of libertarians are very enthusiastic about charity and philanthropy; they are less enthusiastic about being forced into it at gunpoint.

Is there any point to having this conversation here?